This chapter focuses on the wiring and devices used in residential and office branch circuits. It starts by reviewing the National Electrical Code (NEC 2002) branch circuit requirements and includes ...

Two lamps connected in series with an open switch and a cell The circuit diagram shows a circuit ... to the current in the supply. The wiring in a house connects all appliances together in parallel.

where power enters the house. We can see how circuits work, and represent them with some simple diagrams, using basic electrical components like these. You start with a cell, or combination of cells.